Padding out Thumbnails

Let's say I want to resize the above image down to 108px by 108px. Obviously looking at my original image, the image would be distorted if I had it fill this 'thumbnail' version.

If I use the MagickImage.Resize(100, 100) command, this works great but the end image size is roughly 108 x 65. What I truly want is for the remaining space to be transparent, centering the original image into the resized 100 x 100 image.